…unless you compare actual returns on justetf, and note, that the (by a mere 0.1%) “more expensive” iShares ETF has so far slightly outperformed the “less expensive” Xtrackers ETF, since the latter’s inception.
I wouldn’t optimise to the last base point.
Yes, tax efficiency. Keep in mind that there are probably hardly any (inexpensive) brokers left that will let EU retail customers buy US ETFs. With the notable exception of Interactive Brokers - and possibly some of their resellers.
Also it seems tax matters could get a bit more complicated and/or nasty, whether in Switzerland or after a move abroad.